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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe510dc79b275d17a28ebc9dfe6eebc58f72bbe73f4d8080cff50e3639079809' 
  AND token = 'jvfvSs3a9WvENphkqzW5k8QV96Yp8lW2Ye8t7HnsGv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}